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|  DSH 638; [) a; W! D$ e$ i1 z2 |/ X% k
/ o+ @, m0 h9 _/ r | Resistance to heat and fire. U, O3 _! l) _2 R4 q6 t
| 30.2.3.17 n3 j' i# G w6 e& Y; d- `
| 60335-1(ed.4)
6 @ x- y" a1 n. e N+ ^: p% t |
; M5 ?3 q ^+ TQuestion:
; U: K7 | Q3 f8 d( S' Z, T* QSub-clause 30.2.3.1 reads: "parts of insulating material supporting connections that carry a current exceeding 0,2 A during normal operation, and parts of insulating material within a distance of 3 mm of such connections, shall have a glow-wire flammability index of at least 850ºC according to IEC 60695-2-12, the test sample being no thicker than the relevant part"
/ [: W% h6 ]; FCertain motors, have a nominal current around 0,2 A (for example, the pump of a washing machine), but during a certain time (for instance, because changes in the load, or the in-rush current) the current exceeds the limit of 0,2 A. D& P9 C' e8 T; h
Shall the current in these periods of the motor be ignored, independently of its duration, in order to compare with the 0,2 A limit?
" ]) \" W- S* ?2 e4 t4 _& ]4 c5 qDecision:
4 V) ^9 \* }3 ^The current to be considered will be the average current in the relevant operating period.7 a0 n( X- ?7 L" I" P2 G7 ?. D9 K1 \7 ^
$ w% k% K7 }1 |8 V
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发表于 2012-9-8 15:38
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